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Add --nounput if Flex supports the --noFUNCTION options, as at least

some versions that support those options don't support disabling yyunput
by defining YY_NO_UNPUT.

If it doesn't support those options, don't check if it supports
generating reentrant scanners, as we can't add any --noFUNCTION options
to suppress generation of functions.
master
guy 15 years ago
parent 9070702bd0
commit b2e8e34e97
  1. 30
      runlex.sh

@ -7,7 +7,7 @@
# means that neither Flex nor Lex was found, so we report an error and
# quit.
#
# @(#) $Header: /tcpdump/master/libpcap/runlex.sh,v 1.3 2007-12-31 02:40:21 guy Exp $
# @(#) $Header: /tcpdump/master/libpcap/runlex.sh,v 1.4 2007-12-31 03:38:39 guy Exp $
#
#
@ -75,16 +75,28 @@ then
have_flex=yes
#
# Does it support -R, for generating reentrant scanners?
# If so, we're not currently using that feature, but
# it'll generate some unused functions anyway - and there
# won't be any header file declaring them, so there'll be
# defined-but-not-declared warnings. Therefore, we use
# --noXXXX options to suppress generating those functions.
# Does it support the --noFUNCTION options? If so, we pass
# --nounput, as at least some versions that support those
# options don't support disabling yyunput by defining
# YY_NO_UNPUT.
#
if flex --help | egrep reentrant >/dev/null
if flex --help | egrep noFUNCTION >/dev/null
then
flags="$flags --noyyget_lineno --noyyget_in --noyyget_out --noyyget_leng --noyyget_text --noyyset_lineno --noyyset_in --noyyset_out"
flags="$flags --nounput"
#
# Does it support -R, for generating reentrant scanners?
# If so, we're not currently using that feature, but
# it'll generate some unused functions anyway - and there
# won't be any header file declaring them, so there'll be
# defined-but-not-declared warnings. Therefore, we use
# --noFUNCTION options to suppress generating those
# functions.
#
if flex --help | egrep reentrant >/dev/null
then
flags="$flags --noyyget_lineno --noyyget_in --noyyget_out --noyyget_leng --noyyget_text --noyyset_lineno --noyyset_in --noyyset_out"
fi
fi
else
#